obsidian-second-brain

# Obsidian Second Brain > Claude operates your Obsidian vault as a self-rewriting knowledge base. An evolution of [Karpathy's LLM Wiki pattern](https://gist.github.com/karpathy/442a6bf555914893e9891c11519de94f): sources rewrite existing pages instead of just appending, contradictions reconcile automatically, and scheduled agents maintain the vault while you sleep. > Everything worth remembering gets saved. Every update propagates everywhere it belongs. --- ## Quick Start ### 0. Choose vault access method (in order of preference) Try these methods in order. Use the first one available: **Method 0 - SessionStart hook (if configured):** If `hooks/load_vault_context.py` is wired as a SessionStart hook in `~/.claude/settings.json`, `_CLAUDE.md` is injected into context automatically at session start. Skip step 1 below. To wire it: `bash scripts/setup.sh "/path/to/vault"` or run `/obsidian-setup`. **Method A - Direct filesystem (default, always works):** Use standard file tools (Read, Write, Edit, Glob) against the vault path. The vault is plain markdown, so every operation in this skill works this way with no setup. This is the normal path in Claude Code - the commands below use these tools directly. **Method B - MCP server (optional, mainly for non-Claude-Code clients):** This repo ships its own MCP server at `integrations/obsidian-mcp-server/` that exposes the vault as tools (`obsidian_search`, `obsidian_read_note`, `obsidian_save_note`, `obsidian_capture`, plus curator ...